const fs = require("fs");
const data = fs.readFileSync("/dev/stdin");
const result = data
  .toString("ascii")
  .trim()
  .split(" ")
  .map((x) => parseInt(x))
  .reduce((a, b) => a + b, 0);
console.log(result);
process.exit(); // 请注意必须在出口点处加入此行
